We are "overdue" to make macOS 15 part of our regular automated testing for client headful tests.
However we still have some outstanding tests that always fail there, or in some cases have been seen to fail at least some times.
Perhaps some of these have been resolved by macOS 15 updates.

I will capture the list of OPEN test failures here, and any that aren't confirmed as resolved by the time we start this testing will need to be problem listed for macOS